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1-]. E. MURPHY, Jr. LIQUBFIEDIANESTHETIG. No. 275,511; j Patented Apr. 10,1883.

"WITNESSES: I INVENTQRL W Mz ATTQRNBY S.

- N. PETERS. Plwlmhlho nphn. Wahinton. 0.1;

UNITED STATES PATENT OFFICE.

EDWARD E. MURPHY, JR, OF TOTTENVILLE, NEW YORK.

LIQUEFI ED AN/ESTHETIC.

SPECIFICATION forming part of Letters latent No. 275,511, dated April 10, 1883.

Application filed January 15, 1883.

To all whom it may concern:

Be it known that I, EDWARD E. MURPHY, Jr., of Tottenville, in the county of Richmond and State of New York, have invented a new and Improved Etherized Nitrous-Oxide Gas, of which the following is a full, clear, and exact description.

Nitrous oxide, generally known as laughing-gas,is commonly administered by dentists to produce anaesthesia, for the purpose of permitting dental operations to be performed without painingthe patient. The effect of the nitrous oxide-that is, the anaesthesia produced by the gas-very frequently disappears before the operation is completed, and thus causes much discomfort to the patientand aunoyance to the operator.

The object of my invention is to improve the anaesthetic properties of the gas in such a manner that the anaesthesia produced will be of longer duration. To this end I saturate the nitrous oxide with sulphuric ether in a manner that will be fully set forth and described hereinafter.

Reference is to be had to the accompanying drawing, forming part of this specification, in'

which the apparatus which I use for saturating the nitrous oxide with sulphuric ether is shown, parts being in section.

The nitrous oxide is produced in theusual manner, and when in a perfectly-pure state it is conducted through the pipe A into the gasometer B, of the usual construction. From the said gasometer it passes through the outletpipe 0 into a cylindrical vessel, D, and from the same to a compressing-pump, E, in which it is liquefied by subjecting it to a pressure of from seven hundred to eight hundred pounds per square inch. In the liquefied state it is contained in closed wrought-iron vessels, in which it is sold to the consumers. As soon as the liquid gas is drawn from the said vessel (No specimens.)

and liberated it expands and assumes the gaseous form again. A series of transverse partitions, F, are formed of some fabric within the cylindrical vessel D, and a sufficient quantity of sulphuric ether is poured into the said vessel D to cause the lower parts of the said fabric partitions to be immersed in sulphuric ether. By the capillary attraction the sulphuric ether is distributed over the entire surface of thefibrous partitions, and as the nitrous oxide passes through the vessel Dit must pass through the partitions Fsaturatedwith liquid sulphuric ether. Thereby the nitrous oxide becomes saturated withsulphuric ether, and in that state passes to the pump E and is compressed. When saturated the nitrous oxide contains about from five to six per cent. of sulph uric ether.

The etherized nitrous oxide thus produced causes anaesthesia much more rapidly than the ordinary nitrous oxide, and the anaesthesia is of considerably longer duration. The etherized nitrous oxide is perfectly harmless, if properly administered.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l'. The process of forming a permanentlycompressed portable liquid compound of sulphuric ether and nitrous oxide, which consists in forcing nitrous-oxide gas through fabric saturated with sulphuric-ether liquid and then compressing the mixture into a liquid form, as described.

2. The product of the above-described process, beinga permanently-com pressed portable liquid compound of nitrous oxide and sulphuric ether, substantially as described.

EDWARD E. MURPHY, JR.

Witnesses OSCAR F. GUNZ, G. SEDGWICK. 

